Simplify output handling for binary morphology.
Fix overflow in NumPy 1.7 as suggested by Julian Taylor.
Restore @ahojnnes's overflow test.  Correctly assign out argument.
Test that output argument is utilized.
Test that output argument is correct.
Revert to >0 for determining binary values. Document that input should be binary.
DOC: Change sampling kwarg name to spacing in marching_cubes

The preference is to follow VTK's convention for anisotropic
rectangularly sampled data, using the keyword `spacing` rather
than `sampling`. This change converts the last remaining use of
`sampling` in scikit-image to `spacing`.
Add logger deprecation to todo list
DOC: Change sampling to spacing in skimage.draw.ellipsoid and tests
DOC: Fix capitalization in ellipsoid docstring.
Merge pull request #780 from JDWarner/spacing_marching_cubes

DOC: Change sampling kwarg name to spacing in marching_cubes
Merge pull request #779 from ahojnnes/log-depr

Add logger deprecation to todo list
Pre-allocate memory for convolution and re-use for output, if no user-override specified.
Allocate less memory, if possible.
Update docs to match output.
Tweak markup of docstring.
Provide stable doc version by naming docs directory 0.9.x, e.g.
PEP8
PEP8 another one
DOC: fix syntax error